摘要:
The invention relates to a membrane electrode assembly (MEA) for a fuel cell, which comprises a planar polymer membrane. Said membrane, in a tangentially inner area, is coated on both sides with an electrode structure, and, in a tangentially outer area projecting at least on one side beyond the electrode structure coating, is connected to a sealing element. The polymer membrane is embedded in the elastomer sealing element with a marginal zone thereof. The sealing element extends tangentially inwards to a transition area that lies tangentially between the outer area and the inner area, where it externally overlaps the electrode structures on both sides of the polymer membrane.
摘要:
The invention relates to gas diffusion electrodes with improved proton conduction between an electrocatalyst located in a catalyst layer and an adjacent polymer electrode membrane, capable of being used at operating temperatures of up to the boiling point of water, ensuring lasting high gas permeability. The invention also relates to a production method and to corresponding fuel cells. At least one part of the particles of an electrically conductive carrier material in the catalyst layer is at least partially charged with at least one porous, proton-conducting polymer which can be used above the boiling point of water. Charging and development of the porous structure is carried out in a phase inversion method. The inventive gas diffusion electrodes can be used in high-temperature fuel cells working at temperatures beyond the boiling temperature of water without a drop in performance in normal operation mode.